an intermediate spectrum macrolide antibiotic C??H??NO?? produced by Streptomyces erythreus, occurring as a slightly yellow, crystalline powder, effective against most gram-positive and certain gram-n, kiirikseentest saadav antibiootikum. E. toimib stafülo-, strepto-, gono- ja meningokokkidesse, difteeria- ja teetanusetekitajaisse ning mõningaisse teistesse mikroorganismidesse.